US5457678A - Method and circuit arrangement for the transmission of message packets according to the asynchronous transfer mode in a communication network - Google Patents

Method and circuit arrangement for the transmission of message packets according to the asynchronous transfer mode in a communication network Download PDF

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Publication number
US5457678A
US5457678A US08/235,924 US23592494A US5457678A US 5457678 A US5457678 A US 5457678A US 23592494 A US23592494 A US 23592494A US 5457678 A US5457678 A US 5457678A
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Prior art keywords
message packets
transmission paths
different transmission
atm
interface controller
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Expired - Lifetime
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US08/235,924
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English (en)
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Ernst-Heinrich Goeldner
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Nokia Solutions and Networks GmbH and Co KG
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Siemens AG
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H04L45/10—Routing in connection-oriented networks, e.g. X.25 or ATM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/24—Multipath
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/26—Route discovery packet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/55—Prevention, detection or correction of errors
    • H04L49/552—Prevention, detection or correction of errors by ensuring the integrity of packets received through redundant connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5603—Access techniques
    • H04L2012/5609—Topology
    • H04L2012/561—Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5619—Network Node Interface, e.g. tandem connections, transit switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5625—Operations, administration and maintenance [OAM]
    • H04L2012/5627—Fault tolerance and recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5628—Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5649—Cell delay or jitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/25—Routing or path finding in a switch fabric
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/55—Prevention, detection or correction of errors
    • H04L49/555—Error detection

Definitions

  • the present invention is directed to a method and circuit arrangement for the transmission of message packets according to the asynchronous transfer mode (ATH) during the course of virtual connections over at least one ATM switching equipment or an ATH cross-connector in a communication network having a plurality of subscribers.
  • ATH asynchronous transfer mode
  • ATM asynchronous transfer mode
  • High demands are made of the availability of the connections in the entire ATM communication network, particularly when exchanging data.
  • This is true, for example, for the subscribers of a broad band communication network, for example the broad band ISDN (Integrated Services Digital Network), having data applications in the commercial field such as, for example, when coupling a plurality of computer centers or internal data networks (Local Area Network, Metropolitan Area Network).
  • Such applications are characterized by a high data rate of an individual ATM transmission line (for example, 150 Mbit/s), failure of which affects many subscribers.
  • European reference EP-A1 0 384 936 discloses an ATM switching equipment that is redundantly designed in order to insure a disturbance-free switching service for each of the virtual connections in that ATM communication network. Over and above this, there are stand-by circuit measures in ATM cross-connectors for the case wherein connections are briefly unavailable because of line outages or the like. For assuring a high availability of the connections, it is necessary that the subscribers themselves must switch between a used subscriber line and an additional stand-by subscriber line. An interruption-free connection between the subscribers of the data exchange is thus not possible.
  • the method of the present invention is for the transmission of message packets according to asynchronous transfer mode during the course of virtual connections over at least one ATM switching equipment or ATM cross-connector in a communication network having a plurality of subscribers.
  • Identical test message packets are transmitted before the transmission of a first message packet.
  • Respective test message packets are transmitted from an interface controller unit of a transmitting subscriber on at least two different transmission paths having ATM switching equipment or ATM cross-connectors, the two transmission paths being different from one another.
  • Reception points in time for the test message packets switched on the different transmission paths are identified by the interface controller unit of the receiving subscriber. Differences in the running times of the test message packets switched on the different transmission paths are compensated on the basis of the reception points in time.
  • Identical message packets are separately transmitted between the subscribers over the different transmission paths having the ATM switching equipment or ATM cross-connectors and respectively one of these message packets is output.
  • the interface controller unit has a buffer memory for each transmission path for delaying the transmitted message packets for the purpose of compensating the differences in running time.
  • the transmitted message packets can be respectively delayed by a multiple of a message packet.
  • a binary test pattern having a defined bit combination is employed as test message packet.
  • a circuit arrangement of the present invention for the transmission of message packets according to the asynchronous transfer mode during the course of virtual connections over at least one ATM switching equipment or ATM cross-connector in a communication network having a plurality of subscribers has the following elements. At least two different transmission paths having ATM switching equipment or ATM cross-connectors separated from one another are provided between subscribers of the communication network.
  • Offering trunks and serving trunks thereof are respectively connected to interface controller units of a transmitting subscriber and of a receiving subscriber.
  • the interface controller unit has: means for generating a test message packet that is transmitted before the transmission of the first message packet from the transmitting subscriber and is transmitted on the different transmission paths via the separate ATM switching equipment or ATM cross-connectors; a means for identifying reception points in time for the test message packets switched on the different transmission paths; means for compensating differences in the running times of the switched message packets on the basis of the identified reception points in time; and a means for the output of one of a plurality of identical message packets transmitted on the different transmission paths via the separate ATM switching equipment or ATM cross-connectors.
  • the means for compensating differences in running time are respectively composed of a buffer memory for each transmission path for delaying the transmitted message packets.
  • the transmission of the message packets according to the asynchronous transfer mode ensues on at least two completely different transmission paths having separate ATM switching equipment or separate ATM cross-connectors that can be redundantly designed according to European reference EP-A1-384 936(corresponding to U.S. Pat. No. 5,325,358).
  • redundant connections on different paths result up to the immediate proximity of the individual subscriber, so that a continuous connection for an uninterrupted disturbance-free communication between a first subscriber and a second subscriber is always available network-wide given line outages. It is assured on the basis of the compensation of the differences in running time caused by the different transmission paths that only statistical fluctuations influence the reception points in time of a message packet and the copy thereof at the subscriber, but not the deviations established by the different transmission paths.
  • the differences in running time on the different transmission paths established network-wide can thus be reduced to a minimum in the communication network.
  • FIG. 1 is a block circuit diagram of an ATM communication network for the interruption-free transmission of message packets on different network-wide transmission paths;
  • FIG. 2 depicts one embodiment of an interface controller at the subscribers of the communication network which is only schematically shown in FIG. 1.
  • FIG. 1 schematically shows two subscribers of a communication network that exchange message packets via their terminal equipment DT (for example, data terminals) during the course of virtual connections according to an asynchronous transfer mode ("Asynchronous Transfer Mode-ATM").
  • the message packets are a matter of packets having a fixed length, each of which has a packet header having the particulars indicating the respective virtual connection as well as an information part.
  • the information part contains the actual message signals that can comprise voice and image signals in digital form in addition to data and/or text signals.
  • the disturbance-free uninterrupted data exchange is based, for example, on the redundancy principle of European reference EP-A1 384 936 (corresponding to U.S. Pat. No. 5,325,358) for ATM switching equipment or for ATM cross-connectors and is expanded network-wide onto connections up to the immediate proximity of the subscriber.
  • the redundant network-wide connections are thereby conducted over different transmission paths in the communication network, so that one connection is not always negatively affected by line or system outages.
  • an interface or connection controller unit CCU is located at the respective subscriber.
  • This interface controller unit CCU has equipment according to FIG. 2 that are active dependent on transmission or reception of message packets.
  • a first transmission path has one or more, successive ATM switching equipment ASW1', ASW1' or ATM cross-connectors ACC1', ACC1' whereas one or more ATM switching equipment ASW2, ASW2 or ATM cross-connectors ACC2, ACC2 lie in a second transmission path.
  • Each of the individual ATM switching equipment ASW1 . . . or ATM cross-connectors ACC1 . . . has a plurality of offering trunks and serving trunks available to them via which the transmission of the message packets ensues during the course of the virtual connections.
  • FIG. 2 shows a possible structure of the interface controller unit CCU arranged at the subscriber that, in addition to assuming a few functions of the transmission side and reception side known from European reference EP-A1 384 936 (corresponding to U.S. Pat. No. 5,325 358), assumes special jobs on the basis of appropriate equipment. Only those circuit parts of the interface controller unit CCU that are required for an understanding of the present invention are thereby schematically shown.
  • the transmission-side function in the interface controller unit CCU covers equipment C1 and C2 allocated to the different transmission paths for the acceptance of the incoming message packet on the subscriber line from the data terminal DT and for defining the two individual connections in the network for the transmission paths.
  • the respective connection through the ATM network from the first subscriber to the second subscriber is produced by a virtual channel number (virtual channel identifier VCI) in combination with a virtual path number (virtual path identifier, VPI).
  • VCI virtual channel number
  • VPI virtual path number
  • the two numbers contained in the packet header of the incoming message packet are converted by the equipment C1 and C2 into numbers individually defined for each transmission path. These numbers serve the purpose of forwarding the message packet via the serving trunk of the ATM switching equipment ASW1 or of the ATM cross-connector ACC1 and of the ATM switching equipment ASW2 or of the ATM cross connector ACC2 for the respective virtual connection.
  • sequence number for the unambiguous allocation of the message packet switched via the first transmission path to the identical message packet switched on the second transmission path is co-transmitted.
  • This sequence number is composed, for example, of the sequence number employed in the ATM adaptation layer for monitoring the packet sequence.
  • test message packets each respectively composed of a test patterns with a defined bit combination, is thereby generated at the transmission side by a means TCG in the interface controller unit CCU and is respectively transmitted both of the first as well as on the second transmission path to the reception side as first information preceding the actual message signals.
  • the reception-side function in the interface controller unit CCU respectively covers one acquisition means TCR per transmission path which recognizes the identical test message packets switched by the ATM switching equipment ASW1 . . . or, respectively, ASW2 . . . or by the ATM cross-connectors ACC1 . . . or, respectively, ACC2 . . . and are made available to an evaluation unit TU that is connected to the acquisition means TCR.
  • the evaluation unit TU identifies the reception points in time of the test message packets arriving on the two different transmission paths and having the identical content.
  • the buffer memory BUF is fashioned as a turnaround memory (FIFO memory).
  • the delay of the one message packet in comparison to the other message packet thereby ensues in multiples of a single message packet.
  • the two buffer memories BUF provided for the various transmission paths have their output sides connected to a further means CU that, like the evaluation means disclosed by European reference EP-A1 384 936 (corresponding to U.S. Pat. No. 5,325, 358), accepts the message packets switched on the different transmission paths and, by evaluating the sequence number respectively attached to the identical message packets, outputs only one of the two message packets to the subscriber at the receptions side via the subscriber line to the data terminal DT.
  • One application of the present invention is in a broad band communication network, for example the broad band ISDN (Integrated Services Digital Network), wherein a high fail safety is required for the connections between the subscribers.
  • a broad band communication network for example the broad band ISDN (Integrated Services Digital Network)
  • data applications such as, for example, the coupling of a plurality of computer centers or internal data networks via such a broad band communication network that require a communication operation functioning disturbance-free, since the outage of a single broad band line affects a number of users given the high data rates of the individual ATM lines.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
US08/235,924 1993-05-28 1994-05-02 Method and circuit arrangement for the transmission of message packets according to the asynchronous transfer mode in a communication network Expired - Lifetime US5457678A (en)

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DE4317951.7 1993-05-28
DE4317951A DE4317951C1 (de) 1993-05-28 1993-05-28 Verfahren und Schaltungsanordnung zur Übertragung von Nachrichtenpaketen nach dem Asynchronen Transfermodus in einem Kommunikationsnetz

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EP (1) EP0631412A3 (de)
JP (1) JP2933825B2 (de)
CA (1) CA2124418C (de)
DE (1) DE4317951C1 (de)
RU (1) RU94018501A (de)

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US5946294A (en) * 1995-03-16 1999-08-31 Siemens Aktiengesellschaft Redundancy-optimized communication network for the transmission of communication signals
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US6298052B1 (en) * 1997-03-03 2001-10-02 Alcatel Communication method used in a shared resource transmission system
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Cited By (38)

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Publication number Priority date Publication date Assignee Title
US5559959A (en) * 1993-09-16 1996-09-24 Siemens Aktiengesellschaft Method for transmitting message cells via redundant virtual path pairs of an atm communication network
US5946294A (en) * 1995-03-16 1999-08-31 Siemens Aktiengesellschaft Redundancy-optimized communication network for the transmission of communication signals
US6580690B1 (en) * 1995-07-26 2003-06-17 Koninklijke Philips Electronics N.V. Security by doubling at least certain logic paths in a telecommunications network
US6202082B1 (en) 1996-08-27 2001-03-13 Nippon Telegraph And Telephone Corporation Trunk transmission network
US6598092B2 (en) 1996-08-27 2003-07-22 Nippon Telegraph & Telephone Corporation Trunk transmission network
EP0844755A3 (de) * 1996-08-27 1999-12-15 Nippon Telegraph And Telephone Corporation Verbindungsübertragungsnetzwerk
US6298052B1 (en) * 1997-03-03 2001-10-02 Alcatel Communication method used in a shared resource transmission system
EP0983667A4 (de) * 1997-05-22 2005-07-27 Telcordia Tech Inc System und verfahren zum laufzeitausgleich in einem dynamischen paketvermittelten netz
US6721327B1 (en) 1998-05-14 2004-04-13 Telefonaktiebolaget Lm Ericsson (Publ) Delayed packet concealment method and apparatus
US6925054B1 (en) * 1998-12-07 2005-08-02 Nortel Networks Limited Network path protection
US20050265338A1 (en) * 2001-06-27 2005-12-01 Chapman John T Downstream remote physical interface for modular cable modem termination system
US7688828B2 (en) 2001-06-27 2010-03-30 Cisco Technology, Inc. Downstream remote physical interface for modular cable modem termination system
US7639620B2 (en) 2001-06-27 2009-12-29 Cisco Technology, Inc. Packet fiber node
US20070150927A1 (en) * 2001-06-27 2007-06-28 Cisco Technology, Inc. Packet fiber node
US20030208616A1 (en) * 2002-05-01 2003-11-06 Blade Software, Inc. System and method for testing computer network access and traffic control systems
WO2004036444A1 (en) * 2002-10-15 2004-04-29 Blade Software, Inc. System and method for testing computer network access and traffic control systems
US7188189B2 (en) * 2003-04-02 2007-03-06 Avaya Technology Corp. System and method to improve the resiliency and performance of enterprise networks by utilizing in-built network redundancy
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CA2124418A1 (en) 1994-11-29
RU94018501A (ru) 1996-04-20
DE4317951C1 (de) 1994-05-26
EP0631412A3 (de) 2003-01-02
JP2933825B2 (ja) 1999-08-16
JPH0730559A (ja) 1995-01-31
EP0631412A2 (de) 1994-12-28
CA2124418C (en) 2004-07-06

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